Elevator-guard



(N0`Mode1.)

J. J. KNAPP.

ELBVATOR GUARD.

Patented June 5, 1883..

N PETERS, mnmnognpw. washing. nu

NITED STATES ATENT OFFICE.

J. JEROME KNAPP, OF SOUTH GARDNER, MASSACHUSETTS.

ELEVATOR-GUARD.

SPECIFICATION forming part of Letters Patent No. 278,974, dated June 5,1883,

Application filed March 5, 1883. (No model.)

T0 all whom, t may concern:

Be it known that I, J. JEROME KNAPP, of South Gardner, in the county of Vorcester and State of Massachusetts, have invented certain Improvements in Elevator Guards, of which the following is a specification.-

This invention has for its object to provide a simple device for closing gates pertaining to elevator wells or passages by the movement of the elevator, and it consists in the improved attachment which I will now proceed to describe and claim.

Ot' the accompanying drawings, forming a part of this speciiication, Figure I represents a vertical section of a portion of a iioor of a building, showing an elevator, a gate, and my improved attachment for releasing the gate. Fig. 2 represents a section on line :c a", Fig. l.

The same letters of reference indicate the same parts in all the iigures.

In the drawings, arepresents an elevator of ordinary construction.

b represents a iloor of the building, and c represents the gate which obstructs the passage or opening through which access is had to the elevator, said gate sliding in vertical guides in the frame-work in which the elevator moves.

d represents my improved attachment, which consists of Ya lever pivoted at e to the framework and provided at its lower end with a spring, f, which presses the upper end of the lever against the gate, so that when the gate is raised the upper end of said lever will spring under thelower edge of the gate and act as a detent to hold the gate in an elevated position, as shown. The lower portion ofthe lever d is provided with two protuberances, 7L h, ar-

ranged one above and the other below a stud or arm, z', projecting from the platform of the elevator when said platform is on the saine level as the floor. When the platform rises or falls from the position shown the stud or arm i strikes one or the other of the protuberances lL h and presses the lower end of the lever d inwardly, and thus .withdraws its outer end from under the gate and allows the latter to fall. It will be seen, therefore, that when the elevator reaches the level of the floor, and the attendant raises the gate, the lever d will automatically engage and hold the gate in a raised position until the elevator moves upwardly or downwardly, when the gate is automatically released and allowed to fall by its own weight.

The attachment is very cheap and simple and requires no alteration of the gate or elevator, excepting the addition of the stud or arm fi to the elevator.

I claim- The combination, with an elevator, of a vertically-sliding gate forming a guard for the hatchway, a lever, as d, pivoted Vbeside the gateway, and having projections, as shown, adapted to be engaged by the elevator as it rises and falls, so as to trip the lever, and the spring j', arranged, as shown, to bear against the lever below its pivot, all constructed and arranged to operate substantially as sta-ted.

In testimony whereof I have signed my name to this speciiication, in the presence of two subscribing witnesses, this 2d day of March, 1883.

J. JEROME KNAPP.

Titnesses C. F. BROWN; A. L. N Vnrrn. 

